Sprung mass damping control system of vehicle

Abstract

A sprung mass damping control system of a vehicle, which aims to suppress sprung mass vibration generated in a vehicle body of a vehicle provided with at least a motor-generator (first and second motor-generators) as a drive source, includes a sprung mass damping control amount calculating device that sets a sprung mass damping control amount for suppressing the sprung mass vibration, and a drive source control device (a motor-generator control device) that executes sprung mass damping control by controlling a motor-generator control amount of the motor-generator to realize the sprung mass damping control amount.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to a sprung mass damping control system of a vehicle, which suppresses sprung mass vibration generated in a body of a vehicle provided with at least a motor-generator as a drive source.[0003]2. Description of the Related Art[0004]Technology referred to as sprung mass damping control that suppresses sprung mass vibration generated in a vehicle body using predetermined vibration damping means is well known. For example, Japanese Patent Application Publication No. 2004-168148 (JP-A-2004-168148) and Japanese Patent Application Publication No. 2006-69472 (JP-A-2006-69472) describe technologies that control the driving force of a vehicle in order to suppress sprung mass vibration in the vehicle. In the technologies described in JP-A-2004-168148 and JP-A-2006-69472, the driving force is controlled by increasing or decreasing the engine torque. To perform this control, these technologies increase or decrea...

AI Technical Summary

Benefits of technology

[0018]Also, in the sprung mass damping control system described above, the other damping control may be drive train damping control that suppresses drive train vibration in the vehicle, and when the drive train damping control is executed simultaneously with sprung mass damping control using the motor-generator, the motor, or the generator, sprung mass damping control using the motor-generator, the motor, or the generator may be restricted by prohibiting sprung mass damping control using the motor-generator, the motor, or the generator, or by reducing the sprung mass damping control amount.

[0020]Also, in the sprung mass damping control system described above, when motor load ratio restricting control of the motor-generator, the motor, or the generator is being executed, sprung mass damping control using the motor-generator, the motor, or the generator may be restricted by prohibiting sprung mass damping control using the motor-generator, the motor, or the generator, or by reducing the sprung mass damping control amount.

[0025]The sprung mass damping control system of a vehicle according to this invention executes sprung mass damping control using output from the motor-generator, which enables sprung mass damping control that is more precise than sprung mass damping control performed using output from the engine to be performed.

Problems solved by technology

However, the states of the air and fuel that are supplied to the engine are not always constant.

Therefore, the fuel stored in the fuel tank of the vehicle may not necessarily be homogenous fuel.

Moreover, engines have poorer responsiveness for generating the required torque (i.e., engine torque) than motors do.

Therefore, the control precision of sprung mass damping control may decease if engine torque is used.

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